diff --git a/lib-vector.md b/lib-vector.md
index 590bc2e..31e0c64 100644
--- a/lib-vector.md
+++ b/lib-vector.md
@@ -22,4 +22,4 @@
 
 ### `.to-string : Vector<t> -> String`
 
-### `.next : Vector<t> -> Maybe<t>`
+### `.next : Vector<t>[] -> Maybe<t>`